HSK 7-9
动不动
dòngbudòng副
(typically followed by 就) apt to (lose one's temper, catch a cold etc); at the drop of a hat
他动不动就因为小事生气。
Tā dòng bu dòng jiù yīn wèi xiǎo shì shēng qì.
He gets angry over minor matters at the drop of a hat.
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Appears across levels (7-9) in the HSK 3.0 word list.